An Extended Deterrence Regime to Counter Iranian Nuclear Weapons : Issues and Options by 
Nuclear Non-Proliferation in International Law - Volume V by 
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Extended Deterrence can be described as a confrontation in which the policymakers of one state (defender) threaten the use of force against another state (potential attacker) in an attempt to prevent that state from using military force against an ally-- or territory controlled by an ally (protege) of the defender-- (History, Politics, & Society)
Assurance is a strategy directed at allies that seeks to convince said allies of the United States' committment to their defense-- (Brooks, "Extended Deterrence, Assurance, & Reassurance in the Pacific")
